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USGS CMG InfoBank: Ancient Landslide

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Comment: 10:27 - 11:12 (00:45)

Source: Annenberg/CPB Resources - Earth Revealed - 16. Mass Wasting

Keywords: "Perry Ehlig", "mass wasting", landslide, "Portuguese Bend", "Palos Verdes Peninsula", road, construction, fill, slope, base, movement, "geologic hazard"

Our transcription: In more recent times, the situation has grown much more serious as larger masses of earth have shifted.

Perry Ehlig acknowledges that Portuguese Bend was once the site of ancient slide activity, long before there were any people around, but he contends that modern slide problems of the area are a direct result of road building.

A great deal of fill dirt was placed on the upslope edge of the slide where the slide base has a very steep slope, and this loaded the slide and caused it to start to move.

The movement propagated seaward, and it eventually developed into the large landslide that occurs throughout this area right now.

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